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Hello,
RAID configuration on windows server 2016 considering AD and Exchange server 2016
Are you installing Exchange on a Domain Controller? Thats not recommended
https://learn.microsoft.com/en-us/exchange/plan-and-deploy/deployment-ref/ms-exch-setupreadiness-warninginstallexchangerolesondomaincontroller?view=exchserver-2019
For the storage supported and best practices by Exchange 2016, see:
https://learn.microsoft.com/en-us/exchange/plan-and-deploy/deployment-ref/storage-configuration?view=exchserver-2019
Mailbox Calculator:
https://techcommunity.microsoft.com/t5/exchange-team-blog/released-exchange-2013-server-role-requirements-calculator/ba-p/593922
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(28.799999999999997, 82%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEY%3C/text%3E%3C/svg%3E)
It's recommended to use the calculator before you plan your servers/purchase the devices.
And do you consider virtulizing the servers? Virtual environments typically make more efficient use of server hardware, see pros and cons here:https://www.veeam.com/wp-virtualizing-exchange2013-right-way.html
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I am writing here to confirm with you how the thing going now?
If you need further help, please provide more detailed information, so that we can give more appropriate suggestions.